ableos/sysdata/programs/filesystem_fat32/src/main.hb

stn := @use("../../../libraries/stn/src/lib.hb");
.{string, memory, buffer, log} := stn

attributes := @use("attributes.hb")
datetime := @use("datetime.hb")
directory := @use("file.hb")
bios_parameter_block := @use("bios_parameter_block.hb");
.{bpb_sanity_check, ebr_sanity_check, fs_info_sanity_check} := bios_parameter_block;
.{BiosParameterBlock, ExtendedBootRecord, FSInfo} := bios_parameter_block

FAT12_THRESHOLD := 4085
FAT16_THRESHOLD := 65525

ExFAT := 0
FAT12 := 1
FAT16 := 2
FAT32 := 3

calculate_fat_type := fn(sector_size: uint, total_clusters: uint): uint {
	if sector_size == 0 {
		return ExFAT
	} else if total_clusters < 4085 {
		return FAT12
	} else if total_clusters < 65525 {
		return FAT16
	} else {
		return FAT32
	}
}

main := fn(): int {
	bpb := BiosParameterBlock.new()
	ebr := ExtendedBootRecord.new()
	fsi := FSInfo.new()

	fat_type := calculate_fat_type(1, 100)

	if fat_type != FAT32 {
		log.warn("filesystem_fat32 driver only supports Fat32.\0")
	}

	bsc := bpb.sanity_check()
	esc := ebr.sanity_check()
	fssc := fsi.sanity_check()

	msg_type := 0

	loop {
		// Open file
		if msg_type == 0 {
			// Paths without a node-disk component are to be treated as local files.
			file_path := "node-disk:/test\0"
		} else {
			// error
		}
	}

	return 0
}